Finding part number for 1991 Grohe Metro E cartridge

I have what I think is a 1991 Grohe Metro E shower fixture in my master bath. The valve system recently broke â€“ canâ€™t turn water on, handle just spins. When I took off the handle and removed the cartridge, i found that the â€œuniversalâ€ ball joint (controlling flow and temperature) had broken and I guess I need a new cartridge but I canâ€™t find a part number on any item...and no online part site will help w/o it....Suggestions on how to look this item up?

I have what I think is a 1991 Grohe Metro E shower fixture in my master bath. The valve system recently broke – can’t turn water on, handle just spins. When I took off the handle and removed the cartridge, i found that the “universal” ball joint (controlling flow and temperature) had broken and I guess I need a new cartridge but I can’t find a part number on any item...and no online part site will help w/o it....Suggestions on how to look this item up?

-george

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Hi George,
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